Yes, there are some good sources out there. DWM and parent company Ludw. Loewe & Cie. made most of their own tooling and also supplied other manufacturers like FN in Belgium.
There are tooling brochures and a nice reference book from that era. Basically lathes, milling machines, drills combined with jigs and checked with go-no go gauges between steps.
Hand fitting and correction done when needed. Workers were paid per correct step, so were motivated to do a decent job. If their work had to be corrected, it came from their pay.
Moderne Gewehrfabrikation by Otto Maretsch in 1913 is a good starter.
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